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<?php
/**
* We have an interesting problem we attempt to solve with Segment_Cookie. A few facts, please.
*
* 1) It's preferred to use the client-side JS API to phone home to Segment.io.
* 2) We need a decent way to output this tracking script based on a server-side event.
* 3) We can't check `did_action()` on this event, as often times, we've been redirected after the fact.
*
* Ergo, Segment_Cookie. A simple API, provided to do one simple task: Track server-side events, on the client-side.
* Two great examples: `wp_login` and `wp_insert_comment`.
*/
class Segment_Cookie {
/**
* Sets a cookie, both via `setcookie()` and with the $_COOKIE superglobal. Prefixed with segment_.
* Defaults to one day, though in reality, could just be a matter of minutes.
*
* @param string $key The name of the cookie that we're setting.
* @param string $value The value of the cookie.
*
* @since 1.0.0
*/
public static function set_cookie( $key, $value ) {
@ setcookie( 'segment_' . $key . '_' . COOKIEHASH, $value, time() + DAY_IN_SECONDS, COOKIEPATH, COOKIE_DOMAIN );
$_COOKIE[ 'segment_' . $key . '_' . COOKIEHASH ] = $value;
}
/**
* A handy utility function to get the cookie that has been set.
* Allows you to either get the value of the cookie, or confirm that it has been set and is equal to a specific value.
*
* @param string $key Required name of cookie to check for.
* @param string $value
*
* @since 1.0.0
*
* @return bool|string Returns true if cookie exists, or if cookie exists and matches value. False if it does not exist, or does not match value. Return value if it exists and $value parameter is not set.
*/
public static function get_cookie( $key, $value = '' ) {
if ( ! empty( $value ) ) {
return isset( $_COOKIE[ 'segment_' . $key . '_' . COOKIEHASH ] ) && $value === $_COOKIE[ 'segment_' . $key . '_' . COOKIEHASH ];
} else if ( isset( $_COOKIE[ 'segment_' . $key . '_' . COOKIEHASH ] ) ) {
return $_COOKIE[ 'segment_' . $key . '_' . COOKIEHASH ];
} else {
return false;
}
}
/**
* Unsets cookie via AJAX call.
* Used specifically via AJAX, as it uses wp_send_json_success().
*
* @param string $key Name of cookie.
*
* @since 1.0.0
*/
public static function unset_cookie( $key = '' ) {
if ( isset( $_POST['key'] ) ) {
$key = sanitize_text_field( $_POST['key'] );
}
@ setcookie( 'segment_' . $key . '_' . COOKIEHASH, '', time() - DAY_IN_SECONDS, COOKIEPATH, COOKIE_DOMAIN );
unset( $_COOKIE[ 'segment_' . $key . '_' . COOKIEHASH ] );
wp_send_json_success( $key );
}
}
add_action( 'wp_ajax_segment_unset_cookie' , array( 'Segment_Cookie', 'unset_cookie' ) );
add_action( 'wp_ajax_nopriv_segment_unset_cookie', array( 'Segment_Cookie', 'unset_cookie' ) );